Home Addition Drawings · St. Petersburg, FL
Permit-Ready Home Addition
Drawings for St. Petersburg, FL
Expand your home with a permitted room addition, second story, or family room extension. We deliver complete, code-compliant drawing sets for St. Petersburg's building department — in 10 business days, starting at $1,497.
14-day money-back guarantee · 10 business day turnaround
Local Intelligence
What St. Petersburg Homeowners Need to Know Before Submitting
Size & Zoning Rules
Any new square footage added to your St. Petersburg home counts against the same zoning envelope that governs ADU size, meaning large additions may affect your ability to add a future ADU. St. Petersburg's current ADU size cap is 800 sq ft — within the typical range for most floor plan configurations.
St. Petersburg does not impose an owner-occupancy requirement, so you can rent both the main home and any ADU or conversion as investment units.
If the addition creates a second unit or is later converted to a rental, St. Petersburg's ADU market supports approximately $2,200/month for a 2-bedroom unit.
Permit Process & Fees
Construction Services and Permitting permit fees for this project type typically range from $2,500 to $10,000 depending on project valuation and scope. Plan check runs approximately 7 weeks — though each correction cycle adds 3–6 weeks, which is why code-compliant drawings matter so much.
Addition permit packages submitted to Construction Services and Permitting must include a site plan, floor plans, all four elevations, an electrical plan, and energy compliance documentation — plus stamped structural drawings are always required for any load-bearing elements, second-story work, or new foundation.
Visit Construction Services and Permitting ↗Construction Cost Context
St. Petersburg's home addition construction costs run $200–$330 per square foot — a wide range driven by labor markets, local code complexity, and finish level. Our drawings are priced at a fraction of what a full-service architect would charge to produce the same permit set.
⚠ Common Pitfall in St. Petersburg
Because most of St. Petersburg sits inside the FEMA flood zone and coastal overlay district, your ADU plans need a Coastal Development Permit on top of the standard building permit — and that review alone can tack on 3-6 extra weeks before Construction Services and Permitting even looks at your drawings. If your lot is in a older neighborhood like Old Northeast or Historic Kenwood, expect the city to also check your base flood elevation, which often means raising the ADU's finished floor higher than you'd planned, adding real cost to the foundation. And since Pinellas County bans short-term rentals on these units, plan on a long-term tenant or family use only — banking on Airbnb income here just won't fly.
Expert Verdict — Marcus Reid, Licensed Designer
"In my experience, that $250/sqft and 7-week timeline read like statewide averages rather than St. Pete realities—I'd get a couple of local contractor quotes and call Construction Services and Permitting directly before budgeting, since our coastal overlay triggers a CDP review that routinely adds weeks beyond a standard plan check, especially on incomplete drawing sets. What the data also doesn't show is that with STRs off the table here, your ADU pencils out best as long-term rental or family housing, so plan your financing around that use from day one."
Market Context
St. Petersburg has a median home value of $309,000. Comparable renovation projects in this market typically add 25.0% to resale value.
Neighborhoods in St. Petersburg with the strongest home addition and resale value potential include Historic Old Northeast, Snell Isle, Crescent Lake, Downtown / Uptown (Grand Central), Historic Kenwood. High single-family density near downtown and waterfront jobs makes it prime for ADUs.
Permit Process
Permit applications are reviewed by the Construction Services and Permitting, with a plan check timeline of approximately 7 weeks. Permit fees in St. Petersburg range from $2,500 to $10,000 depending on project scope. Design review: Yes - in historic districts only.
St. Petersburg falls within Seismic Design Category SDC A, which affects structural requirements for any new addition tying into the existing structure.
Properties within St. Petersburg's Coastal Overlay Zone require a Coastal Development Permit in addition to standard building permits.
Local Financing Resources
Local Home Addition Lenders in St. Petersburg
These lenders offer HELOC, construction, and renovation loans for home addition projects in Pinellas County. Compare terms before committing.
Offers construction-to-permanent loans for building projects and also offers HELOCs for renovations; typical member-focused loan sizes and competitive credit-union rates.
Visit Lender ↗Local Pinellas County credit union offering fixed home equity loans and HELOCs with competitive terms suitable for home improvements/ADUs.
Visit Lender ↗Large regional credit union serving St. Petersburg that offers HELOCs to fund home improvements and renovations; often competitive rates and member eligibility rules.
Visit Lender ↗Florida bank offering construction loans (including construction-to-permanent) for building projects; useful for ADU construction with standard construction loan underwriting.
Visit Lender ↗Specialty renovation financing platform that partners with credit unions nationwide to offer renovation/after-renovation-based loans often used for ADU projects.
Visit Lender ↗Build With A Plan is not affiliated with these lenders. Always compare rates and consult a mortgage professional.
Local Build Partners
Vetted Home Addition Contractors in St. Petersburg
We draw the plans. These contractors build the addition. Independent — no referral fees paid or received.
Build With A Plan provides drawings only. We are not affiliated with these contractors and do not receive referral fees.
Drawing Package Details
What's Included in Your St. Petersburg Home Addition Package
Transparent Pricing
St. Petersburg Home Addition Drawing Packages
One-time fee. No retainer. No hourly billing.
- ✓Site plan
- ✓Floor plans (existing + proposed)
- ✓All 4 elevations
- ✓Electrical plan
- ✓Title 24 energy compliance
- ✓PDF + DWG delivery
- ✓10 business day turnaround
- ✓Everything in Starter
- ✓Stamped structural drawings
- ✓Foundation plan
- ✓Roof framing plan
- ✓Window & door schedules
- ✓1 round of revisions
- ✓Everything in Standard
- ✓3D rendering
- ✓Cross-section details
- ✓Material specifications
- ✓HOA submission package
- ✓2 rounds of revisions
- ✓Priority 5-day turnaround
After You Order
Your Addition Drawings in 3 Steps
Submit Your Project Details
Share your property address, existing floor plan (if available), and the addition scope. We assign your project coordinator within 4 business hours.
We Draft Your Drawings
Our team designs your complete addition drawing set — engineered for St. Petersburg's building department requirements and FL CBC code. Delivered in 10 business days.
Submit to Your Building Dept
Download your complete package and submit to Construction Services and Permitting. We support plan check corrections at no extra charge.
Common Questions
St. Petersburg Home Addition FAQs
Do I need a permit for a home addition in St. Petersburg? +
Yes — any structural addition to your home in St. Petersburg requires a building permit. This applies to room additions, second-story additions, sunrooms, and attached garages. You'll need permit-ready drawings before the building department will accept your application. Our packages are formatted specifically for St. Petersburg's submittal requirements.
How much does a home addition cost in St. Petersburg? +
Home additions in St. Petersburg typically cost between $250.0–$350.0 per square foot depending on the scope, finishes, and structural complexity. A 600 sq ft addition ranges from $150,000 to $210,000. Second-story additions cost more than ground-floor extensions due to structural requirements. Our drawing packages start at $1,497 — a fraction of local architectural fees.
What drawings are required to permit a home addition in St. Petersburg? +
St. Petersburg's building department requires: a site plan showing the addition's footprint and setbacks, floor plans for all affected levels, all four exterior elevations, an electrical plan, and energy compliance (Title 24 in California). Structural plans stamped by a licensed engineer are required for any load-bearing elements — included in our Premium package.
How long does the permit process take for a home addition in St. Petersburg? +
Plan check in St. Petersburg typically takes 7 weeks for home additions. Additions with structural components may require additional review. Complete, code-compliant drawings significantly reduce correction cycles — each cycle adds 3–6 weeks. Our drawings are engineered to pass on the first submittal.
What setbacks apply to home additions in St. Petersburg? +
St. Petersburg enforces minimum setbacks from property lines for all additions: typically 4–5 ft side setbacks and 5 ft rear setbacks, though these vary by zoning district and lot size. Your addition must stay within the buildable envelope. Our site plan documents existing and proposed setbacks and flags any zoning variances required.
Do I need structural drawings for a home addition in St. Petersburg? +
Yes, for most additions. Any load-bearing walls, new foundations, second-story construction, or roof structure changes require stamped structural drawings from a licensed engineer. California's CBC (California Building Code) and seismic requirements make structural plans mandatory for most addition types. Our Standard and Premium packages include stamped structural drawings.
How much do home addition drawings cost in St. Petersburg? +
Our permit-ready home addition drawing packages for St. Petersburg start at $1,497. Local architects and designers typically charge $3,000–$10,000+ for comparable drawing sets. Every package is engineered for FL code compliance and formatted for St. Petersburg's building department. Turnaround is 10 business days with a 14-day money-back guarantee.
Will a home addition increase my home's value in St. Petersburg? +
In St. Petersburg, where median home values are approximately $309,000, a permitted home addition adds square footage that appraisers value as part of the home's gross living area. Return on investment varies by addition type — master suite additions, family room expansions, and additional bedrooms typically recoup 50–75% of project cost in appraised value in FL markets.
Can I add a second story to my home in St. Petersburg? +
Second-story additions are permitted in most St. Petersburg residential zones, subject to height limits and design review requirements. California generally requires ministerial permit approval, but some cities impose design compatibility or neighborhood compatibility review for second stories. Our drawings cover all levels including foundation upgrades, shear walls, and roof framing required for vertical additions.
Nearby Cities
Also Available in St. Petersburg
Adding an ADU instead? See our ADU design service.
Next Steps
Ready to Move Forward With Your St. Petersburg ADU?
You've evaluated your property's eligibility, run the numbers, and seen the market data. The next step is getting permit-ready architectural drawings to submit to Construction Services and Permitting.
Hire a Local Architect
$3,000 – $8,000
- ·4–8 weeks turnaround
- ·Fully custom design
- ·In-person consultations
- ·Direct line to architect
Best for: Highly customized projects, complex sites, or homeowners who want an ongoing designer relationship.
Build With A Plan
$997 – $2,997
- ✓10 business days turnaround
- ✓Permit-ready, CA-code compliant
- ✓Same documents your building dept needs
- ✓14-day money-back guarantee
Best for: Homeowners who want fast, affordable permit-ready drawings for a standard ADU build.
Both options produce permit-ready architectural drawings accepted by Construction Services and Permitting. The right choice depends on your timeline, budget, and how much customization your project requires.